Public Domain. According to the US Navy Naval History and Heritage Command, as of 21 Jul 2010:
Official government photographs and documents are in the public domain and may be scanned and reproduced in print or online. They may be cropped or resized, but their content may not be altered.Additionally, according to the United States copyright law (United States Code, Title 17, Chapter 1, Section 105), in part, "[c]opyright protection under this title is not available for any work of the United States Government".

This is from US Navy's "Extracts from Small Battle Units of Foreign Powers, Appendix III: Japanese Midget Submarines and Explosive Motor Boats", top of page 40.

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